June 2021

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On the cover: Too much fun! Joe Norris enjoys a flight in Sonex Aircraft’s turbocharged Waiex-B prototype. Photographed near Oshkosh, Wisconsin, by Mariano Rosales. Table of contents Buyin…
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1 COMMENT

  1. Dave Prizio’s article in the June ’21 issue on ignition was excellent, however there is one error. The lag angle, or amount in degrees an impulse coupling will retard the spark during cranking, won’t always match the engine magneto timing shown on the engine data plate. For example, the Slick 4371 mag called out by Lycoming for the O-320-E2D engine has a lag angle of 20 degrees and the mag is timed to fire at 25 degrees BTDC.

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